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ADM823SYRJ-R7-ADM823TYRJ-R7-ADM823TYRJZ-R7-ADM825SYRJ-R7
Supervisory Circuit with Watchdog, Manual Reset and Active-Low, Push-Pull Reset Output
Supervisory Circuits with Watchdog and
Manual Reset in 5-Lead SC70 and SOT-23
Rev. 0
FEATURES
Precision 2.5 V to 5 V power supply monitor
7 reset threshold options: 2.19 V to 4.63 V
140 ms (min) reset timeout
Watchdog timer with 1.6s timeout (ADM823, ADM824)
Manual reset input (ADM823, ADM825)
Push-pull output stages:
RESET (ADM823)
RESET, RESET (ADM824/ADM825)
Low power consumption (5 µA)
Guaranteed reset output valid to VCC = 1 V
Power supply glitch immunity
Specified over automotive temperature range
5-lead SC70 and SOT-23 packages
APPLICATIONS
Microprocessor systems
Computers
Controllers
Intelligent instruments
Portable equipment
FUNCTIONAL BLOCK DIAGRAM
VCC
GNDWDI
RESET04534-0-001
Figure 1.
GENERAL DESCRIPTION The ADM823/ADM824/ADM825 are supervisory circuits
which monitor power supply voltage levels and code execution
integrity in microprocessor-based systems. As well as providing
power on reset signals, an on-chip watchdog timer can reset the
microprocessor if it fails to strobe within a preset timeout
period. A reset signal can also be asserted by an external push-
button, through a manual reset input. The three parts feature
different combinations of watchdog input, manual reset input
and output stage configuration, as shown in Table 1.
Each part is available in a choice of seven reset threshold
options ranging from 2.19 V to 4.63 V. The reset and watchdog
timeout periods are fixed at 140 ms (min) and 1.6s (typ),
respectively.
The ADM823/ADM824/ADM825 are available in 5-lead SC70
and SOT-23 packages and typically consume only 3 µA, making
them suitable for use in low power portable applications.
Table 1. Selection Table
TABLE OF CONTENTS Specifications.....................................................................................3
Absolute Maximum Ratings............................................................5
ESD Caution..................................................................................5
Pin Configurations and Function Descriptions...........................6
Typical Performance Characteristics.............................................7
Circuit Description...........................................................................9
Reset Output.................................................................................9
Manual Reset Input......................................................................9
Watchdog Input.............................................................................9
Application Information................................................................10
Watchdog Input Current...........................................................10
Negative-Going VCC Transients................................................10
Ensuring Reset Valid to VCC = 0 V...........................................10
Watchdog Software Considerations.........................................10
Outline Dimensions.......................................................................11
Ordering Guides.........................................................................11
REVISION HISTORY
10/04—Revision 0: Initial Version SPECIFICATIONS VCC = 4.75 V to 5.5 V for ADM82_L, VCC = 4.5 V to 5.5 V for ADM82_M, VCC = 3.15 V to 3.6 V for ADM82_T,
VCC = 3 V to 3.6 V for ADM82_S, VCC = 2.7 V to 3.6 V for ADM82_R, VCC = 2.38 V to 2.75 V for ADM82_Z,
VCC = 2.25 V to 2.75 V for ADM82_Y, TA = TMIN to TMAX, unless otherwise noted.
Table 2.
ABSOLUTE MAXIMUM RATINGS TA = 25°C, unless otherwise noted.
Table 3. Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only and functional operation of the device at these or
any other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
ESD CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on
the human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
GND
VCC
WDI04534-0-002
Figure 2. ADM823 Pin Configuration
GND
RESET
VCC
WDI04534-0-003
Figure 3. ADM824 Pin Configuration
GND
RESET
VCC04534-0-004
Figure 4. ADM825 Pin Configuration
Table 4. Pin Function Descriptions
